Siemens 3RU21264CB0 SIRIUS Thermal Overload Relay. SIRIUS Thermal Overload Relay, 17 to 22 A, 18.5 kW Power, 50 to 60 Hz Frequency, 690 VAC Coil, 1NC-1NO Contact Form, 3 A at 24/110/120/125 VAC, 2 A at 230 VAC, 1 A at 400 VAC, 2 A at 24 VDC, 0.3 A at 60 VDC, 0.22 A at 110/125 VDC, 0.11 A at 220 VDC Contact, 3 Pole, Contactor Mounting, Screw Terminal, IP20 Enclosure, -40 to 60 deg C, 85 mm H x 45 mm W x 85 mm D Dimensions. Additional Description: SIEM-3RU21264CB0 OVERLOAD RELAY CL10 S0 17-22A SCREW. Catalog Description: Overload relay 17...22 a for motor protection sz s0, class 10, f. mounting ontocontactor main circuit screw terminal aux. circuit screw terminal manual-automatic-reset.